Well, I ordered 4 different 5v 30mm fans off ebay last night. I will compare the 4 and see which is quieter and still moves sufficient volume and design for that one. They all are US sourced (though made in China) and all similar in price, around $5. By limiting to US sources and $5, that will eliminate both shipping time and cost problems for anyone wanting to use my design(s). I also put in an order at digikey for a bunch of the connectors lulz used for the head so I can put the same connector on my rig so it plugs right in the same place.
I started work in Modo on mods to the single extruder to replace the tiny fan with a more robust 30mm 5v fan. That should keep the top end much cooler and the thermal transition zone closer to the heater block. It will also give me a foundation to use for a dual all metal hot end dualie using a single fan for the cooling of the upper fins and seperate fans for the extrusion cooling. I want to get the single extruder design down first though and I have some decisions to make.
I did find in some obscure directory a hex stl with Lulz’ design. One with mounting plate, one without. But, I am really considering moving from the hex to a E3D v6. It seems much more widely supported and accepted than the hex and given the inability to order a Lulz’ Hex, well the E3D is looking real good.
So, the biggest decision is whether to abandon the hex hot end or not. I just don’t know enough about the differences between the two hot ends yet to make that decision. For now, I will continue with the Hex as I have one in hand to work with for the single extruder design changes. The problem will come when I begin working on the dual extruder. I simply can’t order a Lulz Hex. And if I can’t order the hot ends, then designing something for them is pointless. So that alone is swaying me toward E3D v6.
By making that little fan 5v and the others 24v, they eliminated a lot of the 12v fans from the computer industry. There are a LOT of 12v fans that are designed to be very quiet and still move decent supplies of air. Not so much in the 5v and 24v ranges though.